Synthesis, characterization, redox properties and reactivities of a group of phenolato complexes of ruthenium(III)

Sinha, Prasanta Kumar ; Chakravarty, Joydip ; Bhattacharya, Samaresh (1997) Synthesis, characterization, redox properties and reactivities of a group of phenolato complexes of ruthenium(III) Polyhedron, 16 (1). pp. 81-87. ISSN 0277-5387

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/027753...

Related URL: http://dx.doi.org/10.1016/0277-5387(96)00251-3

Abstract

Seven complexes of the type [RuIII(PPh3)2(L)Cl2] (where L = 8-quinolinolate, 4-methyl-2-(phenylazo) phenolate and salicylal-diminate anion) have been synthesized by the reaction of [Ru(PPh3)3Cl2] with HL. These complexes are one-electron paramagnetic and show rhombic ESR spectra in 1¦1 dichloromethanetoluene at 77 K. In CH2Cl2 solution, these complexes show intense LMCT transitions in the visible region together with weak ligand-field transitions at lower energies. Each of these complexes shows a ruthenium(III)-ruthenium(II) reduction (-0.12 to -0.40 V vs SCE) and a ruthenium(III)-ruthenium(IV) oxidation (0.78-0.88 V vs SCE) in acetonitrile solution. The potentials of the ruthenium(III)-ruthenium(II) reduction vary linearly with the nature of substituent in L. The [RuIII(PPh3)2(L)Cl2] complexes react with bidentate chelating ligands (L′ = 8-quinolinolate anion, 2,2′-bipyridine, 1,10-phenanthroline) to afford complexes of type [Ru(PPh3)2(L)(L′)]n+These complexes are diamagnetic and show intense MLCT transitions in the visible region. The potential of the ruthenium(II)-ruthenium(III) couple in these complexes depend on the nature of both L and L′.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Ruthenium Phenolates; Synthesis; Characterization; Redox Properties
ID Code:1918
Deposited On:08 Oct 2010 11:30
Last Modified:24 Jan 2011 03:42

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